Electronics Forum | Wed May 08 14:24:22 EDT 2013 | wahahasteven
we are using acrylic conformal coating on the PCB. Under the same program, same parameters (not changing anything on the machine), and we always found one or two boards have some spots which are not coated (shown as picture). The location of the spot
Electronics Forum | Wed May 08 20:14:24 EDT 2013 | davef
What happens when you rework those non-coated areas? Please list your rework steps Br, davef
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Industry News | 2023-04-11 09:52:04.0
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Technical Library | 2017-06-01 17:12:08.0
The corrosion of Nickel-Palladium-Gold (Ni-Pd-Au) finish terminals in humid environments is known to be reduced with the application of a conformal coating such as acrylic. Corrosion has a higher rate of occurrence around the terminal ‘knee’ of a surface mount component, which may be reduced with the application of conformal coatings. Although radio frequency (RF) plasma processing is generally known to enhance conformity of conformal coating to surfaces through ionic bombardment, the effect on the functionality of assembled printed circuit boards (PCB) is not as well known. The purpose of this study is to assess whether RF plasma processing can enhance the adhesive and coverage qualities of an acrylic conformal coating on PCBs, specifically on Ni-Pd-Au terminals with a knee, and if plasma processing has an effect on the electrical functionality of components and fully assembled PCB.
Technical Library | 2007-08-28 20:18:06.0
A conformal coating is defined as a thin polymeric material which covers the surface of an electronic assembly. These coatings are used to provide an electrically insulative and environmentally protective seal or cover to a completed printed circuit board (PCB).
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Practical Set-Up, Qualification of Cleaning Process in PCB Assembly
SMTnet Express, June 1, 2017, Subscribers: 30,507, Companies: 10,601, Users: 23,315 Evaluating the Effects of Plasma Treatment prior to Conformal Coating on Eectronic Assemblies to Enhance Conformity of Coverage John D. Vanderford, Ann E. Paxton
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| https://www.eptac.com/soldertips/acceptability-of-conformal-coating-bubbles/
) Courtesy of IPC-A-610 Standard Answer: The IPC-A-610 pictures are just there to provide some visual information on the condition being described, in this case the coverage from conformal coating application
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